import pygame import sys # 初始化Pygame pygame.init() # 窗口设置 WINDOW_WIDTH = 600 WINDOW_HEIGHT = 450 BACKGROUND_COLOR = (240, 248, 255) # 浅色背景 TEXT_COLOR = (30, 30, 50) INPUT_BOX_COLOR = (255, 255, 255) INPUT_BOX_ACTIVE_COLOR = (220, 240, 255) BUTTON_COLOR = (70, 130, 200) BUTTON_HOVER_COLOR = (100, 160, 230) RESULT_BG_COLOR = (230, 240, 250) HEADER_COLOR = (60, 100, 150) # 字体设置 FONT = pygame.font.Font(None, 36) SMALL_FONT = pygame.font.Font(None, 28) TITLE_FONT = pygame.font.Font(None, 40) # 定义长度单位与米之间的转换关系 UNITS = { "千米 (km)": 1000.0, "米 (m)": 1.0, "分米 (dm)": 0.1, "厘米 (cm)": 0.01, "毫米 (mm)": 0.001, "英里 (mi)": 1609.344, "码 (yd)": 0.9144, "英尺 (ft)": 0.3048, "英寸 (in)": 0.0254 } class LengthConverter: def __init__(self): self.screen = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT)) pygame.display.set_caption("长度单位转换器") self.clock = pygame.time.Clock() self.running = True # 单位列表 self.unit_names = list(UNITS.keys()) self.unit_display = {name: name.split()[0] for name in self.unit_names} # 选择的单位 self.from_unit = "米 (m)" self.to_unit = "英尺 (ft)" # 输入框 self.input_text = "" self.input_active = True self.input_rect = pygame.Rect(180, 100, 250, 45) # 下拉菜单 self.show_from_dropdown = False self.show_to_dropdown = False self.dropdown_visible_items = 5 self.dropdown_item_height = 35 # 从单位下拉菜单 self.from_dropdown_rect = pygame.Rect(180, 155, 250, 40) self.from_dropdown_items_rect = pygame.Rect(180, 195, 250, self.dropdown_item_height * self.dropdown_visible_items) # 到单位下拉菜单 self.to_dropdown_rect = pygame.Rect(180, 240, 250, 40) self.to_dropdown_items_rect = pygame.Rect(180, 280, 250, self.dropdown_item_height * self.dropdown_visible_items) # 滚动偏移 self.from_scroll = 0 self.to_scroll = 0 # 转换按钮 self.convert_button = pygame.Rect(200, 340, 200, 50) # 结果 self.result = None self.error_message = None def handle_events(self): """处理事件""" mouse_pos = pygame.mouse.get_pos() for event in pygame.event.get(): if event.type == pygame.QUIT: self.running = False elif event.type == pygame.MOUSEBUTTONDOWN: # 关闭下拉菜单 if not self.from_dropdown_rect.collidepoint(mouse_pos) and not self.from_dropdown_items_rect.collidepoint(mouse_pos): self.show_from_dropdown = False if not self.to_dropdown_rect.collidepoint(mouse_pos) and not self.to_dropdown_items_rect.collidepoint(mouse_pos): self.show_to_dropdown = False # 点击从单位选择框 if self.from_dropdown_rect.collidepoint(mouse_pos): self.show_from_dropdown = not self.show_from_dropdown self.show_to_dropdown = False self.input_active = False # 点击到单位选择框 elif self.to_dropdown_rect.collidepoint(mouse_pos): self.show_to_dropdown = not self.show_to_dropdown self.show_from_dropdown = False self.input_active = False # 点击输入框 elif self.input_rect.collidepoint(mouse_pos): self.input_active = True self.show_from_dropdown = False self.show_to_dropdown = False # 点击转换按钮 elif self.convert_button.collidepoint(mouse_pos): self.convert_length() # 处理下拉菜单选择 elif self.show_from_dropdown: self.handle_dropdown_click(mouse_pos, self.from_dropdown_items_rect, self.from_scroll, is_from=True) elif self.show_to_dropdown: self.handle_dropdown_click(mouse_pos, self.to_dropdown_items_rect, self.to_scroll, is_from=False) else: self.input_active = False elif event.type == pygame.KEYDOWN and self.input_active: if event.key == pygame.K_RETURN: self.convert_length() elif event.key == pygame.K_BACKSPACE: self.input_text = self.input_text[:-1] elif event.key == pygame.K_ESCAPE: self.input_text = "" else: # 允许输入数字、负号和小数点 if (event.unicode.isdigit() or event.unicode == '.' or (event.unicode == '-' and len(self.input_text) == 0)): self.input_text += event.unicode # 限制小数点个数 if self.input_text.count('.') > 1: self.input_text = self.input_text[:-1] def handle_dropdown_click(self, mouse_pos, dropdown_rect, scroll, is_from): """处理下拉菜单点击""" if dropdown_rect.collidepoint(mouse_pos): # 计算点击的项 relative_y = mouse_pos[1] - dropdown_rect.y item_index = relative_y // self.dropdown_item_height + scroll if 0 <= item_index < len(self.unit_names): if is_from: self.from_unit = self.unit_names[item_index] self.show_from_dropdown = False else: self.to_unit = self.unit_names[item_index] self.show_to_dropdown = False self.result = None self.error_message = None def convert_length(self): """执行长度转换""" self.error_message = None self.result = None if not self.input_text: self.error_message = "请输入长度值" return try: value = float(self.input_text) except ValueError: self.error_message = "请输入有效的数字" return # 转换为米 meters = value * UNITS[self.from_unit] # 转换为目标单位 result_value = meters / UNITS[self.to_unit] # 格式化结果 if abs(result_value) < 0.0001 and result_value != 0: self.result = f"{result_value:.6e}" elif abs(result_value) >= 1000000: self.result = f"{result_value:.2e}" elif result_value.is_integer(): self.result = f"{int(result_value)}" else: if abs(result_value) < 0.01: self.result = f"{result_value:.6f}" elif abs(result_value) < 1: self.result = f"{result_value:.4f}" elif abs(result_value) < 1000: self.result = f"{result_value:.3f}" else: self.result = f"{result_value:.2f}" # 移除末尾多余的0 if '.' in self.result: self.result = self.result.rstrip('0').rstrip('.') def draw_dropdown(self, rect, selected_unit, show_dropdown, scroll, is_from): """绘制下拉菜单""" # 绘制选择框 color = INPUT_BOX_ACTIVE_COLOR if show_dropdown else INPUT_BOX_COLOR pygame.draw.rect(self.screen, color, rect, border_radius=5) pygame.draw.rect(self.screen, HEADER_COLOR, rect, 2, border_radius=5) # 显示选中的单位 display_text = f"{self.unit_display[selected_unit]} ({selected_unit.split()[1][1:-1]})" text = SMALL_FONT.render(display_text, True, TEXT_COLOR) self.screen.blit(text, (rect.x + 10, rect.y + 10)) # 绘制下拉箭头 arrow_points = [(rect.right - 20, rect.centery - 5), (rect.right - 10, rect.centery - 5), (rect.right - 15, rect.centery + 5)] pygame.draw.polygon(self.screen, HEADER_COLOR, arrow_points) # 绘制下拉选项 if show_dropdown: items_rect = pygame.Rect(rect.x, rect.bottom, rect.width, self.dropdown_item_height * self.dropdown_visible_items) pygame.draw.rect(self.screen, INPUT_BOX_COLOR, items_rect) pygame.draw.rect(self.screen, HEADER_COLOR, items_rect, 2) # 计算可见项 start_idx = scroll end_idx = min(len(self.unit_names), start_idx + self.dropdown_visible_items) for i in range(start_idx, end_idx): item_rect = pygame.Rect(rect.x, rect.bottom + (i - start_idx) * self.dropdown_item_height, rect.width, self.dropdown_item_height) # 高亮当前选中的项 if self.unit_names[i] == selected_unit: pygame.draw.rect( self.screen, BUTTON_HOVER_COLOR, item_rect) # 显示单位 unit = self.unit_names[i] display_text = f"{self.unit_display[unit]} ({unit.split()[1][1:-1]})" text = SMALL_FONT.render(display_text, True, TEXT_COLOR) self.screen.blit(text, (item_rect.x + 10, item_rect.y + 8)) # 绘制滚动条（如果项目太多） if len(self.unit_names) > self.dropdown_visible_items: scrollbar_rect = pygame.Rect(rect.right - 10, rect.bottom, 10, self.dropdown_item_height * self.dropdown_visible_items) pygame.draw.rect(self.screen, HEADER_COLOR, scrollbar_rect, 1) # 滚动条滑块 scroll_ratio = scroll / \ (len(self.unit_names) - self.dropdown_visible_items) slider_height = max( 20, scrollbar_rect.height * self.dropdown_visible_items / len(self.unit_names)) slider_y = scrollbar_rect.y + scroll_ratio * \ (scrollbar_rect.height - slider_height) slider_rect = pygame.Rect( scrollbar_rect.x, slider_y, 10, slider_height) pygame.draw.rect(self.screen, BUTTON_COLOR, slider_rect) def draw(self): """绘制界面""" self.screen.fill(BACKGROUND_COLOR) # 绘制标题 title_text = TITLE_FONT.render("📏 长度单位转换器", True, HEADER_COLOR) title_rect = title_text.get_rect(center=(WINDOW_WIDTH // 2, 35)) self.screen.blit(title_text, title_rect) # 绘制输入区域 input_label = SMALL_FONT.render("输入数值:", True, TEXT_COLOR) self.screen.blit(input_label, (self.input_rect.x - 95, self.input_rect.y + 12)) # 绘制输入框 color = INPUT_BOX_ACTIVE_COLOR if self.input_active else INPUT_BOX_COLOR pygame.draw.rect(self.screen, color, self.input_rect, border_radius=5) pygame.draw.rect(self.screen, HEADER_COLOR, self.input_rect, 2, border_radius=5) # 绘制输入文本 input_surface = FONT.render(self.input_text, True, TEXT_COLOR) self.screen.blit( input_surface, (self.input_rect.x + 10, self.input_rect.y + 8)) # 绘制单位标签 from_label = SMALL_FONT.render("从:", True, TEXT_COLOR) to_label = SMALL_FONT.render("到:", True, TEXT_COLOR) self.screen.blit( from_label, (self.from_dropdown_rect.x - 45, self.from_dropdown_rect.y + 10)) self.screen.blit(to_label, (self.to_dropdown_rect.x - 45, self.to_dropdown_rect.y + 10)) # 绘制下拉菜单 self.draw_dropdown(self.from_dropdown_rect, self.from_unit, self.show_from_dropdown, self.from_scroll, True) self.draw_dropdown(self.to_dropdown_rect, self.to_unit, self.show_to_dropdown, self.to_scroll, False) # 绘制转换按钮 mouse_pos = pygame.mouse.get_pos() btn_color = BUTTON_HOVER_COLOR if self.convert_button.collidepoint( mouse_pos) else BUTTON_COLOR pygame.draw.rect(self.screen, btn_color, self.convert_button, border_radius=10) pygame.draw.rect(self.screen, (255, 255, 255), self.convert_button, 2, border_radius=10) convert_text = FONT.render("转 换", True, (255, 255, 255)) convert_rect = convert_text.get_rect(center=self.convert_button.center) self.screen.blit(convert_text, convert_rect) # 显示结果 result_y = 420 if self.result is not None: # 获取单位符号 from_symbol = self.from_unit.split()[1][1:-1] to_symbol = self.to_unit.split()[1][1:-1] result_text = FONT.render(f"{self.input_text} {from_symbol} = {self.result} {to_symbol}", True, TEXT_COLOR) result_bg = pygame.Rect(50, result_y - 10, WINDOW_WIDTH - 100, 45) pygame.draw.rect(self.screen, RESULT_BG_COLOR, result_bg, border_radius=8) pygame.draw.rect(self.screen, HEADER_COLOR, result_bg, 1, border_radius=8) result_rect = result_text.get_rect( center=(WINDOW_WIDTH // 2, result_y + 12)) self.screen.blit(result_text, result_rect) elif self.error_message is not None: error_text = SMALL_FONT.render( self.error_message, True, (220, 80, 80)) error_rect = error_text.get_rect( center=(WINDOW_WIDTH // 2, result_y + 12)) self.screen.blit(error_text, error_rect) pygame.display.flip() def run(self): """主循环""" while self.running: self.handle_events() self.draw() self.clock.tick(60) pygame.quit() sys.exit() if __name__ == "__main__": converter = LengthConverter() converter.run()